code: def remove_dead_code(instructions):
      """Dead code elimination"""
      indexof = get_indexof(instructions)
      live_code = set()
  
      def find_live_code(start):
          for i in range(start, len(instructions)):
              if i in live_code:
                  return
              live_code.add(i)
              inst = instructions[i]
              if inst.exn_tab_entry:
                  find_live_code(indexof[inst.exn_tab_entry.target])
              if inst.opcode in JUMP_OPCODES:
                  find_live_code(indexof[inst.target])
              if inst.opcode in TERMINAL_OPCODES:
                  return
  
      find_live_code(0)
  
      # change exception table entries if start/end instructions are dead
      # assumes that exception table entries have been propagated,
      # e.g. with bytecode_transformation.propagate_inst_exn_table_entries,
      # and that instructions with an exn_tab_entry lies within its start/end.
      if sys.version_info >= (3, 11):
          live_idx = sorted(live_code)
          for i, inst in enumerate(instructions):
              if i in live_code and inst.exn_tab_entry:
                  # find leftmost live instruction >= start
                  start_idx = bisect.bisect_left(
                      live_idx, indexof[inst.exn_tab_entry.start]
                  )
                  assert start_idx < len(live_idx)
                  # find rightmost live instruction <= end
                  end_idx = (
                      bisect.bisect_right(
                          live_idx, indexof[inst.exn_tab_entry.end]
                      )
                      - 1
                  )
                  assert end_idx >= 0
                  assert live_idx[start_idx] <= i <= live_idx[end_idx]
                  inst.exn_tab_entry.start = instructions[
                      live_idx[start_idx]
                  ]
                  inst.exn_tab_entry.end = instructions[
                      live_idx[end_idx]
                  ]
  
      return [
          inst for i, inst in enumerate(instructions) if i in live_code
      ]
  
file_path: pytorch/torch/_dynamo/bytecode_analysis.py
imports: import bisect
  import dataclasses
  import dis
  import sys
  from typing import Any, Set, Union
label_desc: Use image node_id 2 for calling a global function with example usage: remove_dead_code(instructions) and returns: unknown